It is now fifty years later, and things have changed little. Eyewitnesses to acts of violence remain as impassive as ever. If there is a difference, it is that now many record the videos of the attack using their cellphones.

It was one such recording of an attack on a young mother in front of her toddler son that has provided police in Salem, N.J., with possible leads to the identity of the perpetrator. The suspect is black, as can be seen in the video which follows, and appears to be wearing a McDonald’s uniform.